Brake for automobiles



June 7.1927. 1,631,448 H. W. ALDEN ET AL BRAKE FOR AUTOMOBILES FiledJuly s1, 1924 2 sheets-snee: v1

.June 7 1927 H, w.AA| DEN ET Al.

BRAKE FOR AUTOMOBILES Filed July 51, 1924 2 sheets-Shea*v 2 PatentedJune 7, 1927.

Unirse "STATES ATENT Frio.

'HERBERT W. ALDEN AND GEORGE HUFFERD, DETROIT, MICHIGAN, ASSIGNORS TOTHE TIMKEN-DETROIT AXLE COMPANY, OF DETROIT, MICHIGAN,'A CORPORATION orMICHIGAN.

' Application'iea July 31,

' Our invention relates to brakes, particularly to air or other `fluidpressure brakes intended for use'on the front or rear wheels ofautomobiles and it has for its principal objects to produce a brake thatis simple, compact and easily operated and is not likely vto get out ofrepair.

The invention consists in the brake and in the parts and combinations ofparts hereinafter described and claimed.

In the accompanying drawings which form part of this specification andwherein like reference numerals refer to like parts wherever they occur.

Fig. 1 is a top plany View of a brake con l struction embodying myinvention,

. Fig. 2 showing the brake operating mecha- Fig. 2 is an elevation,certain parts. beingI shown in vertical section on a line 2-2 of Fig. 3,l

Fig. 3 is a vertical sectional view, and

Fig; 4 is a fragmentary View similar to nism in moved position.

Mounted onithe axle spindle `1 is an annular member 2 that abuts against'a shoulder f 3 -on said spindle, said member constituting the brakesupport. In the embodiment shown in the drawin s, a front axle spindle lis shown. Mounte on said spindle 1 are suitable roller bearings 4 thatsupport a wheel hub member 5 tol which member is secured a brake drum 6.The spindle 1 is securedby means of a steering knuckle 7 to the mainaxle 8. Y A brake band 9 is secured to a fitting 10 at a point'oppositethe'space between the free ends of said band. Said fitting 10 isprovided with a hole 11 therethrough in which hole is disposed the endof a rod 12 that is of smaller section lthan said hole. Said rod issecured to the brake support 2. The top of the fitting 10 rests againsta lug 13 that projects from the brake support 2. The fitting 10 isprovided with a .recess 14 in which is disposed a spring 15 that bearson the upper edge of Said rod 12. Thus the spring 15 tends to force saidiitting 10 upwardly against said lug 13, thus retracting the brake band9 from the brake drum 6. The brake band 9 is provided with a suitablebrake lining 16.

The free ends of the brake band are provided with ttings 17 on which areears 18 to which' are securedsprings 19 that tend to BRAKE FORAUTOMOBILES.

1924. Serial N0. 729,298.

draw the free ends of the brake band to# i gether, thus retracting thebrake band from vthe brake drum.

Preferably the 'brake is operated by air diaphragm 22 and with a coverplate 23.A

Resting on said diaphragm is an operating block 24 that extends upwardthrough said lcover plate 23. `An airsupply pipe 25 opens into the airchamber. Y

Pivotally secured to each fitting 17, as by means of a pin 26, is alever of the bell crank type. One arm of. said leverr has its endrounded and resting on the operating block 24. Said block 24 is providedwith a longitudinal slot 28 in which are disposed cam arms 29 that areintegral with or secured to the respective lever arms 27. The curved camsurfaces of said cam arms contact with cach other at a point below theline that extends thnough the centers of the mounting pins 26. he radiusof curvature of each cam surface increases downwardly. When theOperating block is forced upwardly, it moves the ends of the lever arms27 upwardly with it, thereby rocking or swinging Said arms on the pins26.- This rocking or swinging of the lever arms 27 rocks or swings thecam arms 29 upwardly also, thus continuously shifting their point ofcontact to points further and further from their pivots, thereby forcingthe pivots further apart and lspreading the free ends of the brake bandand forcing the brake band against the brake drum.

The mountingl pins 26 are eccentrically i disposed, and are secured inposition by means of cotter pins 3() extending through holestherethrough. By removing the cotter pins and rotating the mounting pins180 de-l grecs, the cam arms 29 may be adjusted by the 'amount ofeccentricity o f said pins.

The operation of the brake is as follows: When air is admitted into theair chamber,

it forces the diaphragm 22 and-the operating V block 24 upward. Theoperating block raises the lever arms 27, and the cam arms'29 spread thebrake band 9 against the brake fitting 10. When the air pressure isreleased, the springs retract the brake band from the brake drum.

rlhe herein described brake has numerous advantages. lt is simple andeasy to operate, and there are ev parts to break or get out of repair.Ol'iviously, the operating block may be moved by a 'lever or by otherfluid pressure than air pressure; bralre shoes or other suitable brakemeans ma;Y be substituted for the brake bandshoivn in the drawings; andnumerous other changes may be made Without departing from the invention;and We do not `Wish 'to be limited to the precise construction shown.

What We claim is:

l. A' brake for automobiles comprising brake means having spaced ends,levers olf the bell crank type pivotally secured on the ends et saidbrake means and each having one end formed into a cam surface whichworks against the cam surtace of the other lever.

2. A brake for automobiles comprising brake means having spaced ends,levers of the bell crank type pivotallv secured on the ends of saidbrake means and each having oneendiormed into a cam surface which Worksagainst the cam surface of the other lever, and iluid pressure operatedmeans for operating' said levers.

3. A brake for automobiles comprising a brakeband having free ends9fittings at the ends'ot said brake band, levers oli' the bell crank typepivotall y mounted on said iittings, and each having one en d formedinto a cam surface which Works against the cam surface ot the otherlever, and springs secured lo said fittings to pull the ends of saidbrake band toward eachother.

4. A brake for automol'iilcs comprising' a brake band and having i'reeends, :Fittings at the ends of said brake band, levers of the bell cranktype pivotally mounted on said fittings and each having;1 one end formedinto a cam surface which Works against the cam surface of the otherleverq and means for operatingq sai-d levers, whereby said cam armsspread the ends of said brake band'.

5. A brake for automobiles comprising a brake band having free ends,bell crank levers pivotally mounted at said ends, an end of each leverbeing formed into a cam surface and the cam surfaces of the two leversWorking against each other, and an operating block for operating saidlevers, said operating block being provided with a slot in which saidcam arms are disposed.

65A brake for automobiles comprising a brake band having free ends, bellcrank levers pivol'ally mounted at said ends, and each having one endformed into a cam sur- ;tace that works against the cam. surface of theother lever, an operating,` block for operatingv against the other endsot said levers, f

said operating blocl; being provided with a slot in-Which said cam armsare disposed, and tluid pressure operated means for actu ating saidoperating block.

7. A brake for automobiles comprising a brake band having.,r 'free ends,ttings at the ends of said brake band, eccentrically disposed pinsmounted in said iittings, bell crank levers pivotallv mounted on saidpins and each having one end formed into la cam surface, the camsurfaces of the two cam arms workingagainst each other whereby .said camarms spread the ends of said brake band, an operatingr block engagingfthe other ends of said levers, and means 'for raising said block toswing said levers.

8. A brake for automobiles comprising a brake band having iree ends,fittings at the ends of said brake band, levers pivotally mounted onsaid fittings and each comprisingd a. lever arm and a cam arm, the camsur- -aces ot' the two cam arms vvorlingr against HERBERT W. ALBEN.GEURGE HUFFERD.

